The Web of Wyrd
There is no medieval attestation of the symbol at all — not on a single rune stone, manuscript or artefact. It appears for the first time only in late-twentieth-century heathen and commercial material, making it a clean case of a design claimed as Viking-age that is in fact recent.
The absence of the Web of Wyrd from any medieval Norse source; its first appearances in late 20th-century heathen material
A nine-line grid symbol sold as an ancient Viking emblem of fate, called 'Skuld's Net'.